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Compensation and Benefit Plans (Restricted Stock Unit Activity) (Details) - Restricted stock units
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Restricted Stock Units  
Beginning balance (in shares) | shares 311,682
Granted (in shares) | shares 119,038
Forfeited (in shares) | shares (11,294)
Vested (in shares) | shares (85,553)
Affiliate transfers, net (in shares) | shares 0
Ending balance (in shares) | shares 333,873
Weighted Average Grant Date Fair Value  
Beginning balance, weighted average grant date fair value (in dollars per share) | $ / shares $ 66.11
Granted, weighted average grant date fair value (in dollars per share) | $ / shares 68.58
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares 63.90
Vested, weighted average grant date fair value (in dollars per share) | $ / shares 78.94
Affiliate transfers, net, weighted average grant date fair value (in dollars per share) | $ / shares 0
Ending balance, weighted average grant date fair value (in dollars per share) | $ / shares $ 63.78
SCE  
Restricted Stock Units  
Beginning balance (in shares) | shares 159,985
Granted (in shares) | shares 63,042
Forfeited (in shares) | shares (10,095)
Vested (in shares) | shares (42,549)
Affiliate transfers, net (in shares) | shares (1,963)
Ending balance (in shares) | shares 168,420
Weighted Average Grant Date Fair Value  
Beginning balance, weighted average grant date fair value (in dollars per share) | $ / shares $ 66.16
Granted, weighted average grant date fair value (in dollars per share) | $ / shares 68.24
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares 63.93
Vested, weighted average grant date fair value (in dollars per share) | $ / shares 79.11
Affiliate transfers, net, weighted average grant date fair value (in dollars per share) | $ / shares 68.16
Ending balance, weighted average grant date fair value (in dollars per share) | $ / shares $ 63.78